Years ago' when I had very little experience and my chooks were probably fed an inadequate breeder diet, my Barnevelder chicks would go down on their hocks within the first couple of weeks. I gave them free access to meat meal and they would have an almost spontaneous recovery. That was my first lesson in poultry nutrition.
Table 1. Nutrient content of various slaughterhouse by-products
Ingredient DM Energy CP EE CF Ca Met Lys
Meat and bone meal, 45% 92 1080 45.0 8.5 2.5 11.0 0.53 2.20
Meat and bone meal, 50% 93 1150 50.0 8.5 2.8 9.20 0.67 2.60
Meat meal, 55% 93 1220 55.0 7.2 2.5 7.60 0.75 3.0
DM = Dry matter (% of total content)
Energy = Energy in kcal/lb.
CP = Crude protein (% of total content)
EE = Crude fat (ether extract; % of total content)
CF = Crude fiber (% of total content)
Ca = Calcium (% of total content)
Met = Methionine (% of total content)
Lys = Lysine (% of total content)
(Source: Feedstuffs Ingredient Analysis Table: 2011 Edition, by Amy Batal and Nick Dale, University of Georgia) http://articles.extension.org/pages/673 ... to-poultry
A quick search indicates that Methionine and Lysine are also significant in the treatment of Rickets. I would only offer add lib as they can be over dosed.